When you try to modify an existing list - there are some restrictions in place on how that list can be modified. Here is a list of restrictions:
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PII attribute columns cannot be modified to change types.
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Unique ID columns cannot be modified to change types.
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You cannot add a new PII attribute column type on a data list.
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A numeric column can only be changed to Day, Month or Year - these cannot be modified to change type to Numbers & Letters.
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Date Timezone column types cannot be changed
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Other PII [Plain Hash] Column Types cannot be changed